Sansui T-80 - FM Stereo Adjustment

FEED SIGNAL MEASURE
STEP SUBJECT | ——_Feep sional | wpasune | ADJUST
| FROM ~—s [| -To | OUTPUT
Same as above LO01, LO2
F-3130
90 MHz
ANT Input Minimum
value with sine wave
1 kHz(100% MOD)
FM SSG
Same as
above
7. |90 MHz
RF Adj.
ADJUST FOR REMARKS
Max. Output
8. | Signal 98 MHz SIGNAL VRO1 Make 3 indication
Indicator Adj. | ANT Input 20 dBf Indicator F-3000 segments lighting SIGNALOOO
<T-80 Only> | (14.8 dB), 1 kHz
(100% MOD) FM SSG
AU
98 MHz Same as | Same as above Confirm every 8 indication segment
(59.8 SBE above lighting signaLoooooooo
(100% MOD) FM SSG
No Input Same as above Confirm only one indication segment SIGNALO
lighting
(2) FM STEREO Adjustment
Note: FM MODE/MUTING Switch ....... AUTO/ON
FEED SIGNAL
STEP | SUBJECT MEASURE | apjusT | ADJUST FOR REMARKS
OUTPUT
PLL 98 MHz ANT Input 65 dBf (59.8 dB) | ANT Stereo indicator | VRO1 Light indicator | Adjust the VR within
VCO
Adj.
|
FM
SSG
Pilot
19
kHz
(9%
MOD)
terminal
F-3130
center
of
lighting
level
R (or L) Mode 1 kHz + Pilot (100% | 3002
MOD} STEREO SG
PLL 98 MHz ANT Input 65 dBf (59.8 dB) | Same as_ | JW90 <T-60> | VRO1 19 kHz +50 Hz
VCO Adj. |FM SSG (No MOD) above F-3130 F-3130
jincaseof | i 1 Point B<T-80> |
using Freq. | i F-3133
| Counter (See Fig. 2-1)
2. | Separation | 98 MHz ANT Input 65 dBf (59.8 dB) |Sameas | OUT L-CH VRO2 OUT —40 dB | Confirm separation
Adj. FM SSG Pilot 19 kHz (9% MOD) above VTVM & Scope | F-3130 L-CH >RCH
R Mode 1 kHz + Pilot (100% MOD) (—40 dB)
STEREO SG
Muting 98 MHz ANT Input 15 dBf (9.8 dB) Stereo indicator Stereo indicator
Jevel Adj. | FM SSG Pilot 19 kHz (9% MOD) (VRO3) | turns ON
SUB 1 kHz + Pilot (100% MOD)
STEREO SG
Fig. 2-1. Location of Point B (Measure output of VCO Signal)
Rear View of F-3133
or
OUTPUT
L-CH or R-CH
VTVM & Scope
or
Output Signal
comes out
@ NEW MEASUREMENT FOR FM.
Input signal level under the provision of IHFM-T-200, a new meas-
urement method is indicated by available power ratio “dBf” To
obtain approximate available power ratio “dBf”, abstract 0.8 from
attenuater indication of general FMSG (open load indication type);
however, the former measurement, I[HFM-T-100 is designated to-
gether too.
The way of modulation of IHFM-T-200 is shown below.
modulation modulation modulation
frequency mode factor
FM MONO 1000 Hz 100%
FM STEREO 1000 Hz SUB Pilot 9%
Pilot + SUB
100%
@ The relation between the standard input 65 dBf of IHFM-T-200
and the former indication “dB¥ is shown below.
FM SSG 65.8dB ANT Input 59.8dB
UNIT
ANT 3000,